Precipitation of metals from cyanid solutions.



- PRECIPITATION OP METALS FROM CYANID SOLUTIONS.

APPLICATION FILED MARTBI, 1913. I

1,092,765. Patented Apr. 7, 1914 i l W I N 1 I},

I I 1 1 N -[1 v IT 4 12\ llllllllllllllllllllllllll q 5: t? 11 I Inventor,

Charla s Butters, I

rinrrnn snares rarnnr enr ch.

CHARLES BUTTER-S, OF GAKLAND, CALIFORNIA;

PRECIPITATIOZN 0F METALS FROM CYANID SOLUTIONS.

To all whom it may 00mm Be it known that I, GI-IAnLEs Burmese, a citizen of the United States-of America,

and a resident of Oakland, Alameda county,

. or solid form the surfaces soon becomecov cred with a deposit which arrests further chemical action. y The object of this inventionis to permit the eflicient use of aluminum in such granular or solid form, and conduct the process of precipitation cheaply and effectively.

In the accompanying sheet of drawings which forms a part of this application the figure is a diagram in elevation showing the relation of the various parts for carrying out my invention, with the mill shown in section. i

The solution of cyanid with the precious metals dissolved therein through contact with the ore and the necessary amount of caustic soda is carried by a tank 1 and led therefrom through a supply pipe 2 to a mill 3. This mill consists of a horizontal inclosed cylinder with trunnions i 4 supported in bearings 5 5. It is revolved by a gear 6. Through the trunnions at one end the supplypipe passes into the cylinder,-and is turned up inside to discharge close to the top. The cylinder is lined with aluminum plates 7 7 andpartly filled with granular aluminum 8 8. Both the plates and the granular material being aluminum, serve as the precipitating metal, but it is not essential that the mill be lined with aluminum at the same time that granular aluminum is used, as it has been found that the process Specification of Letters Patent.

Application filed March 31, 1913.

Era-tented a a, reins Serial No. "157,902. i

can be satisfactorily operated with only the granulations, and this is preferable. The tumbling of the aluminum in the mill con tinuously subjects the aluminum to attrition and prevents the accumulation on the surface of deposit which would arrest further chemical action.

From the mill an outlet pipe 9 with its mouth near the top of the cylinder passes through the trunnion at the other end from the trunnion through which the supply pipe enters. The outlet pipe discharges the treated solution and suspended fine precipi tate into a tank 10 where it is kept agitated until drawn therefrom through a pipe 11 and pump 12 and forced into a precipita tion prcsslZ which retains the precipitate and allows the barren solution to fall into a tank 14;

What I claim as new, and desire to secure by Letters Patent of the United States,

1. The process of precipitating precious metals from cyanid solutionswhich consists in the conduction of the solution through a mill wherein commercial aluminum is contained in theformkof granular pieces and continuously subjected to attrition, substaiv tially as described.

2. The process ofprecipitating precious metals from cyanid solutions which consists in the conduction of the solution through a mill wherein commercial aluminum is contained in the form of granular pieces and as a lining and continuously subjected to attrition, substantially as described.

3. The process of precipitating precious metals from cyanid solutions which consists in the conduction of the solution through a rotating mill wherein commercial aluminum is containedin the form of granular pieces and as a lining and continuously subjected to attrition, substantially as described.

Signed at Oakland, Cal, this 22nd day of March, 1913.

cHAnLns nu'rrnns. 

